
// jsx 条件渲染
const loading = true;
function App() {
  return (
    <div className="App">
     this is app--
    {loading && <span>this is app</span>}
    {<br />}
    {loading ? <span>loading...</span> : <span>this is test</span>}
    </div>
  );
}

export default App;
